a1cbe7c08b
Found some copyrights that were not updated the last time the file was changed. Updating copyright dates to reflect the most recent change. Change-Id: Ib6f545db10b77cc7a0b2295a21e824b63974bda5
94 lines
3.5 KiB
Python
94 lines
3.5 KiB
Python
# Copyright 2016, 2017 IBM Corp.
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#
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# All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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from nova.virt import imagecache
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from nova_powervm.virt.powervm.disk import driver
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from oslo_log import log as logging
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from pypowervm.tasks import storage as tsk_stg
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from pypowervm.wrappers import storage as pvm_stg
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from pypowervm.wrappers import virtual_io_server as pvm_vios
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LOG = logging.getLogger(__name__)
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class ImageManager(imagecache.ImageCacheManager):
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def __init__(self, vios_uuid, vg_uuid, adapter):
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super(ImageManager, self).__init__()
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self.vios_uuid = vios_uuid
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self.vg_uuid = vg_uuid
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self.adapter = adapter
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def _get_base(self):
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"""Returns the base directory of the cached images.
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:return: Volume Group containing all images/instances
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"""
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# Return VG for instances
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return pvm_stg.VG.get(
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self.adapter, uuid=self.vg_uuid,
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parent_type=pvm_vios.VIOS.schema_type, parent_uuid=self.vios_uuid)
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def _scan_base_image(self, base_dir):
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"""Scan base images present in base_dir.
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:param base_dir: Volume group containing all images/instances
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:return: List of all virtual disks containing a bootable image that
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were created for caching purposes.
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"""
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# Find LVs in the _get_base VG with i_<partial id>
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prefix = '%s_' % driver.DiskType.IMAGE[0]
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return [image for image in base_dir.virtual_disks
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if image.name.startswith(prefix)]
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def _age_and_verify_cached_images(self, context, all_instances, base_dir):
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"""Finds and removes unused images from the cache.
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:param context: nova context
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:param all_instances: List of all instances on the node
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:param base_dir: Volume group of cached images
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"""
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# Use the 'used_images' key from nova imagecache to get a dict that
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# uses image_ids as keys.
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cache = self._scan_base_image(base_dir)
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running_inst = self._list_running_instances(context, all_instances)
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adjusted_ids = []
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for img_id in running_inst.get('used_images'):
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if img_id:
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adjusted_ids.append(
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driver.DiskAdapter.get_name_by_uuid(driver.DiskType.IMAGE,
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img_id, short=True))
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# Compare base images with running instances remove unused
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unused = [image for image in cache if image.name not in adjusted_ids]
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# Remove unused
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if unused:
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for image in unused:
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LOG.info("Removing unused cache image: '%s'", image.name)
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tsk_stg.rm_vg_storage(base_dir, vdisks=unused)
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def update(self, context, all_instances):
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"""Remove cached images not being used by any instance.
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:param context: nova context
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:param all_instances: List of all instances on the node
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"""
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base_dir = self._get_base()
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self._age_and_verify_cached_images(context, all_instances, base_dir)
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